Development v12

Warning - Product Update

All the resources present on this section belong to Waspmote v12, Waspmote Plug & Sense! v12 and Meshlium v3.8.

If you have a Waspmote v15, Waspmote Plug & Sense! v15 or Meshlium v4.0 please go to the new Development Section.

Check what is your version and what are the differences between the old and the new one in this document.

» HASH 04: SHA-256

This example shows how to calculate SHA-256 message digest to provide INTEGRITY to the sending of information. Both data must be sent over the network: MESSAGE + HASH_MESSAGE

Required Materials

1 x Waspmote
1 x Battery

Notes

- The battery has to be connected.
- This example can be executed in Waspmote v12 and Waspmote v15

Code

/*
 *  ------Waspmote HASH_04 SHA-256 Message Digest--------
 *
 *  This example shows how to calculate SHA-256 message digest to
 *  provide INTEGRITY to the sending of information. Both data
 *  must be sent over the network: MESSAGE + HASH_MESSAGE
 *  
 *  Copyright (C) 2016 Libelium Comunicaciones Distribuidas S.L.
 *  http://www.libelium.com
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 2 of the License, or
 *  (at your option) any later version.
 * 
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 * 
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *  Version:                3.0
 *  Design:                 David Gascón
 *  Implementation:         Alvaro Gonzalez, Yuri Carmona
 */
 
#include "WaspHash.h"


// Original message
char message[] = "Libelium";

// Variable to store the hash message
uint8_t hash_message_sha256[32]; 
    
  
void setup()
{
  USB.ON();
  USB.println(F("HASH_04 example"));
  USB.println(F("- SHA-256 algorithm"));
  USB.println(F("- Message Digest length of 256 bits (32 Bytes)"));
  USB.println();
  
  USB.print(F("Original message: "));
  USB.println(message);
}

void loop()
{	

  // Calculate hash of original message with SHA-256 Algorithm  
  HASH.sha( SHA256, hash_message_sha256, (uint8_t*)message, strlen(message)*8); 
 
  // Printing message digest SHA-256 
  HASH.printMessageDigest("SHA-256:", hash_message_sha256, 32); 

  delay(5000);
}

Output

H#
HASH_04 example
- SHA-256 algorithm
- Message Digest length of 256 bits (32 Bytes)

Original message: Libelium
SHA-256:"D22B6FDCC90777469FF9815F7C0E0026DD857B32466CF8B4B6B23308CB6533EE"

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